The natural world. Looking pretty for 3.5b years.

Comparing Sizes

The era of mammals began at the end of the Cretaceous Period 65 million years ago with the extinction of the dinosaurs that kick-started our evolution. If you were a typical human back then walking hills, plains, and valleys of the era, how would you compare to an elephant bird, a giant sloth, or a cave bear? In physical size, we were relatively minor mammals in comparison to those beasts and many others.

It's a wonder we survived and propered, likely at the expense of these extinct beasts, instead of just becoming fossils: